Signal-relay.



J. F. MCELROY, DECD.

s. H, McELRoY. EXEcuTRrx.

SIGNAL RELAY.

y APPLICATION FILED MAR. 26,1912- v1].80,5l5. Patented Apr. 25, 1916.

backward SO as to retract UNITED STATES PATENT OFFICE.

JAMES F. MCELROY, 0F ALBANY, NEW YORK;

SUSIE I-I. MCELRGY, EXECUTRIX OF SAID JAMES F. ICELROY, DECEASED, ASSIGNOR TO CDNSOLIDATED CAR-HEATING COM- PANY, A CORPORATION OF WEST VIRGINIA.

SIGNAL-RELAY.

Specification of Letters Patent.

i Patented Apr. 25, 1916.

Application filed March 26, 1912` Serial No. 686,429.

To all whom t may concern Be it known that l, JAMES F. MoELRoY, a

citizen of the United States, residing at Albany, county of Albany, State of New York, have invented certain new and useful Improvements in Signal-Relays, the following being a full, clear, and exact disclosure of the one form of my invention which 1 at present deem preferable.

For a detailed description of the present form of my invention, reference may be had to the following specification and to the accompanying drawings, which. illustrate my invention.

Figure lis a vertical section of my device, and Fig. 2 is a front View thereof with the cover removed, parts being in section.

My invention relates to a relay structure designed particularly for use in a crossing signal for railways shown in an application of mine filed March 23, 1912, Serial No. 693,913 but also capable of use in other situations.

Referring to the drawing, 61 represents a box-shaped casting with a removable front cover 62. On the top outside wall is a ringshaped flange 61 intoA which screwed a tubular casing 63 that projects vertically above the box 61 like a chimney to contain the resistance but separated from the interior of the box 61 by a metal wall with only twovsmall holes therein to receive the insulating bushings which project downward from the under side of a block of insulation 67 in said tubular casing. On the inside of box 61 near the bottom are cast inwardly projecting hollow posts 704: and 705 on which is mounted a bar of insulation 78. A similar but broader post 702 is cast near the top of the back plate of the box to which is secured a block of insulation 79. On this block 79 is fastened a bracket 703 which supports and serves as the yoke of a magnet 70. The armature 71 of magnet 70 has on its rear edge a lug which projects loosely through the upright side 75 of a sheet metal angle plate secured to the back side of insulating bar 78, the horizontal side 77 of said angle plate projecting forward under said bar 78 to form an anchorage for the lower end of spring 7 l whose upper end is secured to a projection on the front of armature 71.. The pull of the spring 71 on the armature is downward and slightly the armature and at the same time to hold it with its rear lug 1n the hole in plate 7 Beneath armature 71 1s suspended somewhat loosely the contact bridge-plate 73 with its ends turned down at an angle. A strip of metal 707 bent into T form is secured to the under side of armature 71 and its depending stem passed down somewhat loosely through the center of bridge-plate 73 and a pin passed through it to retain the bridge-plate in position on the stem. The ends of bridgeplate 73, when lifted, engage the underside of contact plates 72, 72, each of which is bent up from a Z-shaped piece of plate metal 76 which embraces two sides of bar 78 and is secured thereto by a bolt and nut which also serves as a connector for the conductor wire leading to the contact. The contacts 72, 72 are placed on opposite sides of the bridge-plate contact 73, one being connected to wire 17, the other to wire 15. At the left of the contacts on bar 78 is a fuse socket 51 in which is gripped the lower end of fuse 50 and to which is secured the entering wire 13 also the aforesaid wire 17 lead; ing from the adjacent contact 72. The up"- per fuse socket 52 is mounted on an insulating plate 708 and a wire 18 therefrom passes through bushing 65 to the wire of resistance 60. The opposite end of resistance 60 is connected to entering wire 141 which passes through the coils of magnet 70 before connecting with the resistance 60.

The resistance wire is wound in coils that are wrapped around a helically grooved and perforated cylinder 66 of porcelain which is held between the block 67 at its lower end and the block 68 at its upper end by means of a long bolt 69 that also passes through the top wall of box 61 and secures the resistance thereto independently of the casing 63 which can be separately applied to its screw flange 64. By this arrangement the resistance can be placed in position outside of the box, and the tube or casing passed down over it. A cap 63a is threaded to engage the correspondingly threaded end of the casing 63. The cap 63a and the bottom of box 62 are provided with attachment lugs 80. One circuit through the apparatus is by the wire 14, which includes the magnet coil, the resistance, the wire 18, the fuse 50 and the wire 13. Another circuit, normally open at the relay contacts 72, 73, includes, the wire 15, said relay contacts, wire 17, fuse 50, the resistance and the wire 14. The latter circuit is controlled by the former.

lVhat I claim as new and desire to secure by Letters Patent is:

1. A relay apparatus of the character described' comprising a main casing provided with a closed top having holes therein, a magnet supported within said casing, a supplemental casing attached to the top wall of the magnet casing, an insulating block within the supplemental casing provided with bushings projecting downwardly through the holes in the top of said casing, a resistance support of insulating material inclosed within the supplemental casing and secured at its base to said insulating block, a resistance wire mounted on said resistance support and having its terminals passed through ysaid bushings, one of said terminals being connected with one of the poles of said magnet, means for connecting line wires with the other terminal of the resistance wire and the other pole of the magnet, respectively, and

' contacts controlled by said magnet.

2. A relay apparatus of the character described, comprising a casing provided with a closed top having holes therein, and also provided with a ring shaped threaded flange, a magnet supported within said casing, a supplemental casing having threads at one end in engagement with the threads of said ange, an insulating block within the supplemental casing provided with bushings projecting downwardly through the holes in the top of said casing, a resistance support of insulating material inclosed Within the supplemental casing and secured at its base to said insulating block, a resistance Wire mounted on said resistance ysupport and Copies of this patent may be obtained fo; nve cents each, by addressing the having its terminals passed through said bushings, one of said terminals being connected with one of the poles of said magnet, means for connecting line wires with the other terminal of the resistance wire and the other pole of the magnet, respectively, and contacts controlled by said magnet.

3. A relay apparatus of the character described comprising a main casing provided with a closed top having holes therein, a magnet supported within said casing, a supplemental casing attached to the top wall of the magnet casing, an insulating block within the supplemental casing provided with bushings projecting downwardly through the holes in the top of said easing, a resistance support of insulating material inclosed within the supplemental casing, and having its lower end resting upon said insulating block, a bolt passed longitudinally through said resistance support, and insulating block and the top wall of said main casing, clamp nuts engaging the ends of said bolt, a resistance wire mounted on said resistance support and having its terminals passed through said bushings, one of said terminals being connected with one of the poles of said magnet, means for connecting line Wires with the other terminal of the resistance wire and the other pole of the magnet, respectively, and contacts controlled by said magnet.

In witness whereof I have hereunto set my hand, before two subscribing witnesses, this 23rd day of March, 1912.

JAMES F. MCELROY. Witnesses;

HERBERT A. CAULKINS, JOHN M. Es'rERLY.

Commissioner ot Patents,

www, n. c." 

